Virtualization - Oct 2023 - [PATCH V1 vfio 9/9] vfio/virtio: Introduce a vfio driver over virtio devices

On Thu, Oct 26, 2023 at 01:28:18PM +0000, Parav Pandit
wrote:
> 
> > From: Michael S. Tsirkin <mst at redhat.com>
> > Sent: Thursday, October 26, 2023 6:45 PM
> 
> > > Followed by an open coded driver check for 0x1000 to 0x103f
range.
> > > Do you mean windows driver expects specific subsystem vendor id
of 0x1af4?
> > 
> > Look it up, it's open source.
> 
> Those are not OS inbox drivers anyway.
> :)
Does not matter at all if guest has drivers installed.
Either you worry about legacy guests or not.

> The current vfio driver is following the virtio spec based on legacy spec,
1.x spec following the transitional device sections.
> There is no need to do something out of spec at this point.
legacy spec wasn't maintained properly, drivers diverged sometimes
significantly. what matters is installed base.

-- 
MST

> From: Michael S. Tsirkin <mst at redhat.com>
> Sent: Thursday, October 26, 2023 8:36 PM
> 
> On Thu, Oct 26, 2023 at 01:28:18PM +0000, Parav Pandit wrote:
> >
> > > From: Michael S. Tsirkin <mst at redhat.com>
> > > Sent: Thursday, October 26, 2023 6:45 PM
> >
> > > > Followed by an open coded driver check for 0x1000 to 0x103f
range.
> > > > Do you mean windows driver expects specific subsystem vendor
id of
> 0x1af4?
> > >
> > > Look it up, it's open source.
> >
> > Those are not OS inbox drivers anyway.
> > :)
> 
> Does not matter at all if guest has drivers installed.
> Either you worry about legacy guests or not.
> 
So, Linux guests have inbox drivers, that we care about and they seems to be
covered, right?
> 
> > The current vfio driver is following the virtio spec based on legacy
spec, 1.x
> spec following the transitional device sections.
> > There is no need to do something out of spec at this point.
> 
> legacy spec wasn't maintained properly, drivers diverged sometimes
> significantly. what matters is installed base.
So if you know the subsystem vendor id that Windows expects, please share, so we
can avoid playing puzzle game. :)
It anyway can be reported by the device itself.